Wave Optics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 28 - 31 of 64

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Question number: 28

» Wave Optics » Young's Double Slit Experiment

Assertion-Reason▾

Assertion (Ꭺ)

In Young’s experiment, the fringe width for dark fringes is same as that for white fringes.

Reason (Ꭱ)

In Young’s double slit experiment performed with a source of white light, only black and bright fringes are observed.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is true but Ꭱ is false

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Question number: 29

» Wave Optics » Young's Double Slit Experiment

MCQ▾

Question

In Young’s double slit experiment 10th order maximum is obtained at the point of observation in the interference pattern for λ = 7000 Å. If the source is replaced by another one of wavelength 5000 Å then the order of maximum at the same point will be-

Choices

Choice (4) Response

a.

16th

b.

12th

c.

14th

d.

18th

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Question number: 30

» Wave Optics » Wavefront

MCQ▾

Question

When a mica sheet (µ = 1.6) of thickness 7 microns is placed in the path of one of interfering beams in the biprism experiment then the central fringe gets shifted at the position of seventh bright fringe. The wavelength of light used will be –

Choices

Choice (4) Response

a.

6000 Å

b.

7000 Å

c.

4000Å

d.

5000 Å

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Question number: 31

» Wave Optics » Diffraction Due to a Single Slit Width of Central Maximum

MCQ▾

Question

A slit of size 0.15 cm is placed at 2.1 m from a screen. On illuminating it by a light of wavelength 5 × 10 -5 cm, the width of central maxima will be

Choices

Choice (4) Response

a.

70 mm

b.

0.14 cm

c.

1.4 mm

d.

0.14 mm

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